Imagine being able to control the height and growth of your plants with precision, ensuring they’re not just healthy but also perfectly suited for retail—all without the hassle of constant pruning. Sounds too good to be true? Well, it’s not. Recent research has uncovered a game-changing method using ethephon substrate drenches to manage plant growth, and it’s shaking up the horticulture industry. But here’s where it gets controversial: while the results are promising, some growers might hesitate to adopt this method, fearing potential risks to plant health. Let’s dive in and explore why this could be a game-changer—or a point of debate.
Controlling Stem Elongation in Perennials
A groundbreaking study examined how ethephon substrate drenches can regulate stem elongation in container-grown herbaceous perennials. The findings? Targeted applications not only keep plant height in check but also maintain overall plant health, ensuring growers can produce uniform, market-ready plants. This is huge for retailers who demand consistency in their offerings. But this is the part most people miss: the precision required for application timing could be a barrier for smaller growers. How do we balance accessibility with effectiveness?
Growth Management in Annual Bedding Plants
Another study focused on annual bedding plants, revealing that controlled ethephon applications can curb excessive growth, resulting in compact, visually appealing plants. This isn’t just about aesthetics—it’s about efficiency. Growers can save time and resources by reducing the need for labor-intensive pruning. However, the question remains: Could over-reliance on chemical regulators lead to long-term soil health issues? It’s a debate worth having.
Industry Implications
Effective growth control is a cornerstone of ornamental horticulture, impacting both visual appeal and operational efficiency. This research offers practical insights for growers to enhance plant uniformity, cut down on pruning, and boost crop marketability. By adopting these methods, producers can move toward more sustainable and profitable practices. But here’s the kicker: As of May 2025, Collate® 2L is the only ethephon product EPA-approved for substrate drench use and foliar sprays. Does this monopoly limit innovation, or does it ensure safety and consistency?
Behind the Research
Led by W. Tyler Rich, a research associate at The Ohio State University, this work was part of his Master of Science degree in Horticulture and Crop Science. The goal? To support the label expansion of Collate® 2L. Meanwhile, W. Garrett Owen, an extension specialist and assistant professor, focuses on sustainable greenhouse nursery systems, including growth regulation and crop diagnostics. Their combined efforts highlight the potential of ethephon drenches, but it’s up to the industry to decide how—and if—to embrace this technology.
The Bigger Picture
Published in the ASHS HortScience journal, this research is backed by the American Society for Horticultural Science (ASHS), a globally respected organization established in 1903. With thousands of members worldwide, ASHS promotes scientific research and education in horticulture, covering everything from breeding to marketing. Their stamp of approval adds weight to these findings, but it also raises a question: Are we doing enough to support smaller growers in adopting these innovations?
Your Turn to Weigh In
What’s your take on using ethephon drenches for plant growth control? Is it a sustainable solution, or does it come with hidden risks? Share your thoughts in the comments—let’s spark a conversation that could shape the future of horticulture. For the full story, check out the research at https://doi.org/10.21273/HORTSCI18418-24 and https://doi.org/10.21273/HORTSCI18579-25.
Disclaimer: This material is edited for clarity and style. Mirage.News remains neutral, presenting all views as those of the author(s).
